Package gwfa. November 17, 2016
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1 Type Package Title Geographically Weighted Fractal Analysis Version Date Package gwfa November 17, 2016 Author Francois Semecurbe, Stephane G. Roux, and Cecile Tannier Maintainer Francois Semecurbe Performs Geographically Weighted Fractal Analysis (GWFA) to calculate the local fractal dimension of a set of points. GWFA mixes the Sandbox multifractal algorithm and the Geographically Weighted Regression. Unlike fractal box-counting algorithm, the sandbox algorithm avoids border effects because the boxes are adjusted on the set of points. The Geographically Weighted approach consists in applying a kernel that describes the way the neighbourhood of each estimated point is taken into account to estimate its fractal dimension. GWFA can be used to discriminate built patterns of a city, a region, or a whole country. Suggests rgdal, rgeos License GPL (>= 2) Imports methods,rcpp (>= ),sp LinkingTo Rcpp NeedsCompilation yes RoxygenNote Repository CRAN Date/Publication :27:38 R topics documented: Grid-class grid_to_spdf guadeloupe gwfa mariegalante Index 7 1
2 2 grid_to_spdf Grid-class Grid class A S4 class to define a grid, the output class of gwfa function. Value an object of class "Grid" Slots cell_size Cell size of the grid bandwith Radius of the Kernel Density Estimator radius Radius of the multiscale analysis q The vector of order of the Renyi entropy sample_size size of the sample for calculate the average of the masses for the different radius and Renyi entropy orders M q (R) Methods [ Gets the value of an object [<- Sets the value of an object grid_to_spdf Transforms Grid Object into SpatialPolygonsDataFrame Transforms Grid Object (the output of the gwfa function) into SpatialPolygonsDataFrame. Usage grid_to_spdf(df,epsg,cell_size=null, bandwith = NULL, radius = NULL, q = NULL, sample_size = NULL) Arguments df epsg cell_size bandwith radius q sample_size the data.frame obtained from the gwfa function EPSG code
3 guadeloupe 3 Details Returns a spatialpolygonsdataframe. Author(s) Cecile Tannier, Stephane G. Roux and Francois Semecurbe library(gwfa) data("mariegalante") test=gwfa(points=mariegalante,q=0,radius=(20*2^((0:6)/2)), bandwith=1600,sample_size=500,cell_size=2000) test=test[test$count>100,]#select the cells with at least 100 points. #estimate the fractal dimension on the 7 radius X=cbind(rep(1,length(test@radius)),log2(test@radius)) fit_frac_dim=(do.call(cbind,test[,4:10]))%*%t(solve(t(x)%*%x)%*%t(x)) test$dimfrac=fit_frac_dim[,2] #create spatial polygon dataframe shp=grid_to_spdf(test,"2970") guadeloupe Centroids of buildings of Guadeloupe (French Island in Caribbean) The guadeloupe centroids has been extracted from OpenStreetMap. Map data copyrighted OpenStreetMap contributors and available from Value x y longitude latitude
4 4 gwfa ## Not run: data("guadeloupe") plot(guadeloupe) ## End(Not run) gwfa Geographically Weighted Fractal Analysis Estimate local fractal dimension of a 2D set of points Usage gwfa(points, q = 0, radius, bandwith, sample_size, cell_size) Arguments points q radius bandwith sample_size cell_size A data.frame containing two rows "x" and "y" corresponding to the longitude and latitude of the set of points analysed The vector of order of the Renyi entropy. q=0 allows calculating more robusting box-counting dimension. the vector of radius of the multi-scale analysis Bandwith of the GWFA. This bandwidth acts as a local-global parameter. A large bandwidth leads to a global analysis. On the contrary, a small bandwidth leads to a local analysis. The unit of measurement is free. It must be the same as the unit of cell_size variable. size of the sample for calculate the average of the masses for the different radius and Renyi entropy orders M q (R). The choice of sample_size is a tradeoff between precision and computing speed. In our experience, 3000 is an appropriate choice. Cell size of the grid. The unit of measurement is free. It must be the same as the unit of bandwith variable. Details GWFA is a spatial method to analyse the variability of multiscale behavior in space of set of points. The vector of radius sets the scale of the multiscale analysis whereas the bandwith describes the size of the neighborhood of the analysis. The cell_size indicate the spacing between the estimate points. sample_size is a technique parameter indicates the size of the sample of the set of points used in the analysis. GWFA is a mix between Sandbox Multifractal analysis and Geographically Weighted Approach. The kernel used is the bisquare (1 ( distance bandwith )2 ) 2
5 mariegalante 5 As output, we get a Grid object. A Grid class inherits from the class data.frame and it is completed by five slots (cell_size, bandwith, radius,q and sample_size) corresponding of input parameters of the gwfa function. Author(s) Cecile Tannier, Stephane G. Roux and Francois Semecurbe References Vicsek, T. (1990). Mass multifractals. Physica A: Statistical Mechanics and its Applications, 168(1), Brunsdon, C., Fotheringham, S., & Charlton, M. (1998). Geographically weighted regression. Journal of the Royal Statistical Society: Series D (The Statistician), 47(3), ## Not run: data("guadeloupe") test=gwfa(points=guadeloupe,q=0,radius=(20*2^((0:6)/2)), bandwith=1600,sample_size=3000,cell_size=2000) test=test[test$count>100,]#select the cells with at least 100 points. #estimate the fractal dimension on the 7 radius X=cbind(rep(1,length(test@radius)),log2(test@radius)) fit_frac_dim=(do.call(cbind,test[,4:10]))%*%t(solve(t(x)%*%x)%*%t(x)) test$dimfrac=fit_frac_dim[,2] #create spatial polygon dataframe shp=grid_to_spdf(test,"2970") #convert to geographic information systems software format library(rgdal) writeogr(shp,"guade_analysis.shp","guade_analysis",driver="esri Shapefile",overwrite_layer = T) #use the cartography package library(cartography) chorolayer(spdf=shp,nclass=5,var="dimfrac",method="fisher-jenks") ## End(Not run) mariegalante Centroids of buildings of Marie-Galante (French Island in Caribbean). Marie-Galante is a dependency of Guadeloupe
6 6 mariegalante The Marie-Galante centroids has been extracted from OpenStreetMap. Map data copyrighted OpenStreetMap contributors and available from Value x y longitude latitude library(gwfa) data("mariegalante") test=gwfa(points=mariegalante,q=0,radius=(20*2^((0:6)/2)), bandwith=1600,sample_size=500,cell_size=2000) test=test[test$count>100,]#select the cells with at least 100 points. #estimate the fractal dimension on the 7 radius X=cbind(rep(1,length(test@radius)),log2(test@radius)) fit_frac_dim=(do.call(cbind,test[,4:10]))%*%t(solve(t(x)%*%x)%*%t(x)) test$dimfrac=fit_frac_dim[,2] #create spatial polygon dataframe shp=grid_to_spdf(test,"2970") ## Not run: library(cartography) chorolayer(spdf=shp,nclass=5,var="dimfrac",method="fisher-jenks") ## End(Not run)
7 Index [,Grid-method (Grid-class), 2 [<-,Grid-method (Grid-class), 2 Grid-class, 2 grid_to_spdf, 2 guadeloupe, 3 gwfa, 4 mariegalante, 5 7
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